IDK what to say except for the blonde ml, rest are rather red flag..... it's seems that yo...

Blonde ML is also no go for me. He saw how MC suffered but was just watching rather than pulling him from there...I don't know what author was thinking making all of them tgth with him. Ick I would be traumatized....

Past life doesn't really matter. What matter is what happened in recent life. As he went back in the point that those stuff in the past didn't happened at all. Everyone can change depending the surrounding & circumstances they are in.

But you can't erase those memories. Just because he went back in time that doesn’t mean the betrayal, cheating, cursing, invalidating him automatically went with it. Just because they didn’t do this things in this lyf doesn’t change their inner self. If it was a real life, Duke would still be papa's boy and cheating, red haired would still act like a jerk, and blondie still be hiding behind and do nothing.

#－.－)This is hard to explain....It's more about the severity of the situation?....ehm...

If you know "7th Time Loop" (not BL) it's sort of similar situation. Though probably worse, as the cold ML even k¡lled her in the 6th Loop, but that's because she was dressed as a male soldier of the enemy faction. Although wary and resentful towards the ML she accepted his proposal of marriage on the condition she doesn't have to perform royal duties in the future the 7th Loop. Anyway, she uses all her past experience to use it into her advantage instead. ML changed in the 7th Loop.
However if was the kind of guy that this FL maried in her past life, 3x, in "When the Black Wolf Calls Me", then she would be better off not to be with that madman, because that guy stays same, no matter how many times she returned to the past, that guy keeps torturing her. (Though unlike the FL of 7th Loop, this one does nothing but repeat the same mistake. At least the Omega in this story wants to try change that bad future)

Besides, black hair Alpha didn't cheat on him, it was his family who did it (An Alpha can't resist an Omega in heat. They would loose control & rationality. He really did loved him in the past). As for red hair, he did what he was hired to do (that's why the MC seeks him out in recent life, before the Duke's family does it). The MC doesn't even know the red hair Alpha much & he even forgot they ever met as kids & forgot he broke their promise & married the Duke instead. Well about blondie is true, he doesn't do anything, but MC didn't seem to care about that. Since in recent life, he still keeps him as his trusted knight by his side. But either way, neither of them has ever hurt the MC physically, nor tortured him. (If it was, MC would have tried hard to stay away from all of them. But he didn't. So that past wasn't as bad as it looks. He could change that destiny & become happy instead. As all 3 ML shows that they truly care & support him in this life).

Personally I don't really like black hair nor blondie. My fav is the red hair. But I don't call neither of them a red flag, with how they try to spoil their Omega now. They only care about him & their kids. A red flag won't ever do that)

I will take that other than that duke. Just because of alpha-omega identity no one has the right to cheat. When he saw that his father doing this and not liking his partner, why he stayed there and let him suffer? If he really loved him, he could just have taken him away from there. It is not like the mc is weak and has no power to protect.
And who really remember a childhood promise? I don’t even remember what I ate yesterday.

Well I don't like the Duke either, but he still didn't cheat by choice. He was forced into it. As a Ducal family, he had no choice to obey his family. Especially when the Omega was pregnant. And being pregnant in that story, meant to stay by that Omega side until he is born. Just what he is doing when the MC was pregnant, those stuff in the past never happened.

And besides the MC had chosen them himself, that's the reason he is wearing their pair rings. As for the Red hair, the promise, he never even forced to make him remember it. He only told his son about it.

If you let the past, that didn't even happen in that time line, get the better of you instead of doing something about it, then you might as well tug your tail between your legs and run away?

Can't argue with that... but just remember that he went against the norm when he married a beta which he should be prepared to counter against his family and protect Mc not always crying and apologizing... even his love doesn't seem qualified... it's just like when one gets adopted and treated like shit and they are we are sorry we couldn't just accept you like Fl of villianess has to die...
And the red dude, suppose he also love him in the past and remember their promise but how he taunts him and make the situation worse , doesn’t seem like his love is genuine at all...

And lastly, if being AO in heat and deliberately hurting the Mc is the reason then I could sy the blode knight has the valid reason since he's a knight under the mc, he possibly couldn’t do anything but there's one instance in the past life that he did try something...

So because of all above reason, I think blode the least red ......